nans pat 2,575 Posted June 8, 2015 Report Share Posted June 8, 2015 got this growing up 1 side of the fence,is there anyway of killing this..i have good weedkiller here,would it still come through heavy plastic ,any idea folks. Quote Link to post Share on other sites
Tiercel 6,986 Posted June 8, 2015 Report Share Posted June 8, 2015 Knot weed is a bar steward to kill although a good systemic weed killer will eventually kill it after a few years of treatment. A chap on the allotments had it on the border fence that his plot lay on. He sprayed at the end of August and only had about 20% regrowth the next year he sprayed that again at the same time and only had a few regrowths. after the third year of doing the same he was clear. TC 2 Quote Link to post Share on other sites
Tiercel 6,986 Posted June 8, 2015 Report Share Posted June 8, 2015 .i have good weedkiller here,would it still come through heavy plastic ,any idea folks. It will push it's way through 4" of concrete, so plastic is a waste of time. TC 1 Quote Link to post Share on other sites
sussex 5,776 Posted June 8, 2015 Report Share Posted June 8, 2015 I had it at my place , came in on a load of free top soil ( my mates description ) , I treated it with round up , commercial strength , about four times before I was happy it was gone . Had it got established it really is a pain to eradicate .. Quote Link to post Share on other sites
Tiercel 6,986 Posted June 8, 2015 Report Share Posted June 8, 2015 I spoke to the chap that had it on his plot and he had done a lot of research on how to get rid of it. Apparently knot weed is like a tree in that the sap falls back to the roots in the Autumn. For the best effect you have to time the spraying to coincide with the sap falling to take the weed killer to the roots. If you look on youtube there are videos of ways of getting rid of knot weed. TC 2 Quote Link to post Share on other sites
spade 224 Posted June 8, 2015 Report Share Posted June 8, 2015 Be extremely careful with knotweed. If not treated properly it can make matters worse. Whatever you do, don't remove any of it from your property, best to burn on site. Stem injection is the approved method of weed killing but it will take multiple treatments to kill it off. Plastic will do no good at all. It will grow through a damn site more than 4" concrete. 3 Quote Link to post Share on other sites
The one 8,398 Posted June 8, 2015 Report Share Posted June 8, 2015 Thought you could beat it down and spray the young new growth for best results Quote Link to post Share on other sites
Tiercel 6,986 Posted June 8, 2015 Report Share Posted June 8, 2015 (edited) Be extremely careful with knotweed. If not treated properly it can make matters worse. Whatever you do, don't remove any of it from your property, best to burn on site. Stem injection is the approved method of weed killing but it will take multiple treatments to kill it off. Plastic will do no good at all. It will grow through a damn site more than 4" concrete. I do believe that soil containing rhizomes of knot weed is now classed as contaminated waist? Waste even TC Edited June 8, 2015 by tiercel 2 Quote Link to post Share on other sites
nans pat 2,575 Posted June 8, 2015 Author Report Share Posted June 8, 2015 got a lemonade bottle of paraquat its been lying a few years ,does it go off ,was gonig to jeg it raw into the stem bit then water a bit down and spray a few times, Quote Link to post Share on other sites
Tiercel 6,986 Posted June 8, 2015 Report Share Posted June 8, 2015 Paraquat is no good, non systemic, it will not kill the rhizomes (roots) of the plant. TC 1 Quote Link to post Share on other sites
moxy 617 Posted June 8, 2015 Report Share Posted June 8, 2015 The best and effective treatment is baseal injection. Not something I have had a hand in but I know a man who has and does. I will ask him tommorow Quote Link to post Share on other sites
Buttons 140 Posted June 8, 2015 Report Share Posted June 8, 2015 Had to deal with it many times. Best way is keep cutting it with mower it goes But other way is heating oil down the stem It will go if you keep on it Quote Link to post Share on other sites
northern lad 2,292 Posted June 9, 2015 Report Share Posted June 9, 2015 Whichever method you use Id do it sharpish,a pal of mine was putting his house on the market,when the estate agent came round he saw the knotweed and told him no mortgage company will touch a property with the stuff growing there,hes bought all the stuff and is treating it himself.... 1 Quote Link to post Share on other sites
antg 1,729 Posted June 9, 2015 Report Share Posted June 9, 2015 Whichever method you use Id do it sharpish,a pal of mine was putting his house on the market,when the estate agent came round he saw the knotweed and told him no mortgage company will touch a property with the stuff growing there,hes bought all the stuff and is treating it himself.... this is very true. house next door to me was repossessed and company put it on the market. a surveyor viewed house and said knotweed was present on the garden hence no mortgage was allowed on the house, cash sale only and it drastically reduced the price. i was very concerned that my property would be labeled too and looked into it further. turns out that the plant was not knotweed and was a dogwood. surveyor had totally made a blunder and it cost the company big time. i know the fella that bought the house and has made a substantial profit because of the surveyor. 1 Quote Link to post Share on other sites
moxy 617 Posted June 9, 2015 Report Share Posted June 9, 2015 Withdrawn from sale but if you know anyone who has a bottle still kicking around. http://msdssearch.dow.com/PublishedLiteratureDAS/dh_08d6/0901b803808d6faa.pdf?filepath=/pdfs/noreg/010-22040.pdf&fromPage=GetDoc Glyphosate will work but you will need to get it in to the hollow stems. And It may take a few doses. Quote Link to post Share on other sites
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